Certainly believing in Trinity or Oneness or Arianism does not mean preaching another

Jesus. Those who preach another Jesus preach that Jesus has come back to earth as another man, or even as a woman. That is preaching another Jesus.
But those who preach Trinity or Oneness or Arianism or Binity, do not believe in another Jesus, they believe in the same Jesus Christ of Nazareth, the Son of God, and son of Mary, as we believe in. They just have different theories about the ultimate nature of Jesus, theories which could be supported by scripture, but not proven, as scripture does not really tell us the ultimate nature of Jesus.
And I don't think there are any Oneness believers who think the voice of the dragon in Rev. 13:11 could be the voice of the Lamb of God, they know the symbolic dragon with the horns like a lamb is an evil voice and not the voice of the true Lamb of God, so I don't see where you got that idea that some Oneness believers think that. That sounds so absurd, no Christian could possibly believe that is the voice of the Lamb of God, Jesus Christ.
And Oneness believers usually think the Holy Spirit is one of the modes or roles of God, they don't usually think it is just a force of God, though there is at least one Oneness denomination that does think that. But denominations who think the HS is just a force of God, are mainly Arian, Unitarian, and Binitarian denominations, rarely Oneness denominations. And of course none of the Trinitarian denominations think that.
Anyway, the Bible does not reveal to us the exact nature of the Holy Spirit. So it is plausible that the Holy Spirit is simply a force or power of God and is not a person. So when the HS speaks, it could be simply God speaking in his power. It could be also that the HS is one of the 7 Spirits of God, but even then we don't know the nature of the Spirits of God, like are they persons of the Godhead, or are they not God, are they forces of God, the Bible does not tell us. Nothing in the Bible tells us how many persons is God, whether one or 2 or 3 or more. We know from the Bible some important things about God, but there is a lot we can't know.